“Bob McGuire” ran a great race as challenger in a heated Virginia Republican primary election that was separated by about 400 votes. So spoke Donald Trump on Friday, who took a brief moment out of his rally in Chesapeake, Virginia, to rip a fellow Republican’s loss, whom the MAGA leader of the free world recently accused of being a backstabber. But Trump — who has famously boasted of acing cognitive tests in recent days, including at Thursday’s presidential debate — couldn’t seem to figure out who, exactly, was his sworn enemy and who should receive praise. Want more breaking political news? C…